examples/json does not work with http/2

[Lingli05]

Tested the examples/json using the following curl commands:

1. curl --verbose -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/

2. curl --verbose -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/mjsonrust

3. curl --verbose -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/manual

4. curl --verbose -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/extractor

Everything worked as expected. However adding --http2-prior-knowledge to the above commands would trigger failure:

1. curl --verbose --http2-prior-knowledge -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/>

2. curl --verbose --http2-prior-knowledge -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/mjsonrust

3. curl --verbose --http2-prior-knowledge -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/manual

4. curl --verbose --http2-prior-knowledge -d '{"name":"value1", "number":100}' -H "Content-Type: application/json" -X POST http://localhost:8080/extractor

I was hoping index_mjsonrust() and index_manual() would work with http/2, but saw the following after dumping req in each function:

index_jsonrust_
HttpRequest HTTP/2.0 POST:/mjsonrust
headers:
"user-agent": "curl/7.58.0"
"accept": "/"
"content-type": "application/json"
"content-length": "31"

ERROR 2018-05-08T21:12:31Z: actix_web::pipeline: Error occured during request handling: user error: release capacity too big
INFO 2018-05-08T21:12:31Z: actix_web::middleware::logger: 127.0.0.1:37984 [08/May/2018:17:12:31 -0400] "POST /mjsonrust HTTP/2.0" 500 0 "-" "curl/7.58.0" 0.000642

[fafhrd91]

could you try master?

[fafhrd91]

Please, reopen if you still see same behavior

[Lingli05]

Tested and it worked well now. Highly appreciated!

[fafhrd91]

fix is part of 0.6.1 release